The intensity of sunlight on Earth is about 1300 Watts per square meter. When you focus the sun’s rays using a magnifying glass (or in this case a sphere of water) you can increase the intensity roughly ten thousand fold.
When focused on dry tinder, this increases the temperature of wood to its autoignition point, starting the reaction with oxygen in the atmosphere. By protecting the hot embers and adding more energy and fuel, you can get these hot coals to start a roaring fire.
Here’s how to start a fire with a sandwich bag and water…
If you like this idea, be sure to share it with your friends and inspire someone you know. Anything becomes possible with just a little inspiration…
